The first pollen culprit each year is typically trees. If
rainfall was good the year before, resulting in solid tree growth, that
typically means healthy trees. Combine that with relatively warm forecasts with
no more freezing temperatures on the horizon and it's a perfect storm of
pollen-filled trees.

Right now in early March, that means the spring pollen allergy season has
already kicked in for most of the Midwest and Southeast, says Charles Barnes,
Ph.D., director of the allergy and immunology laboratory at Children's Mercy Kansas
City and a fellow with the American Academy of Allergy, Asthma & Immunology.

"It seems that the Midwest and Southeast are early and
high, but the Northeast and far West are about normal," says Barnes.

He says counts appear to be earlier and higher this year at pollen count stations in the middle of the U.S. including Oklahoma City; Austin, Texas; Kansas City, Missouri; Lexington, Kentucky; and Dayton, Ohio. Stations in the Southeast also are reporting earlier counts this year. Stations in the Northeast, however, appear to be later or about the same as usual.

The pollen count station in Springfield, New Jersey just
started collecting data, says Barnes, and levels are low.

"None of the other stations in the Northeast seem to
have started yet, probably because of stormy weather. The station in Colorado
Springs seems to be a little earlier this year. But, none of the California
stations have started to collect yet."

The spring allergy season has been starting earlier for
years now, Dr. Clifford Bassett, founder and medical director at Allergy and
Asthma Care of New York,
told Weather.com

"In general over the last 10 years or more, we’ve seen
an earlier start to the spring allergy season by about two weeks," Bassett said. "Each year is different. You’re mostly seeing a longer
season spring through fall because of warmer temperatures."

"[Climate change] is causing more carbon dioxide in our
environment, which in turn tells a lot of plants to produce more pollen, and
the pollen itself is more supercharged and more powerful."

Of course tree pollen isn't the only thing allergy sufferers have to worry about. Just when you're starting to get relief from the trees, that's typically when the grasses start releasing their pollen.

"Grass season typically starts in May and can run through June (at least in St. Louis). Predicting that far in advance is difficult," say Barnes.